I don't know if you're still asserting this, because I honestly can't be bothered to read two pages of single-sentence quoting, but there is pretty much nothing right about this comment. Every new user has an accountable, measurable cost in terms of the bandwidth, storage, and customer support required to service them, as well as potentially deferred costs which will be incurred for changes and updates across the life-time of the product.
Bandwidth is generally a fixed cost - you have the capacity available to support a net presence. How you use it may shape how you allocate the cost internally, but that doesn't make it a marginal cost, since it doesn't actually increase or decrease based on how much of it you use. The wires are there anyway - the only real variable cost is the electricity, and that's pretty darned small.
Storage - how is this variable with an offline CB? It is with the
online CB, because now you keep the character records on the WotC server, but if customers download the CB and use it locally, you need no storage per customer at all.
Customer support is the one
possibly valid item, here, but it's generally set at the level you can afford, not the level you "need" (since that could be debated all day long). Thus, in general, it is a fixed cost (for people and 'phones, basically).
Changes and updates are
fixed costs - i.e. they are the same regardless how many users you have. As such, they are not "marginal costs".
1. It's obviously NOT feasible or they would have done it. Each method is not equal to another which is a big part of your false assumption.
The fact that they have not done it does not demonstrate that it is not feasible - merely that they decided not to do it. They may have had good reasons for that, they may have just not wanted to be bothered, or it may simply not have occurred to them.
2. The character builder is a service, not a physical product. It's no different than Netflix, Amazon Prime, cable TV or any electronic entertainment tool, service or interface of its kind. As for if/when a new edition comes out, so be it. It's not worth worrying about.
For you, maybe. For me, I want a tool I can use to support my campaign, which will likely last a few years. If I watch a film I might be happy never to see it again - but if I do want to see it in future I can always get the DVD. Same with TV. With the new CB, there is just no alternative available if I want a persistent tool - I'm just not allowed to buy one. It's not a huge deal, but it's as broken as a film not being released on DVD would be.
3. And how many people actually need house rule capabilities? And what is their motivation for adding it and how much? While it will be nice when completed I know it wouldn't be my top priority of things to put in if it didn't have all the features/kinks worked out in the stuff I could control.
I don't know how many people want houserules, but they are a long-established part of roleplaying in all systems, and to dismiss those who want them just because you don't care for them seems selfish and cavalier, to me.
It's not going to be a custom tool that can do anything someone wants. That's not realistic because everyone has different wants from it. It will have basic house rule functionality according to announced plans but it's also likely a low priority. It's more important they work on the stuff as they have the game "written" as it serves a larger audience.
It's entirely "realistic" - it's been done with previous editions' character builders, it's been done with the offline character builder, and it's been done with character builders for other systems. It may well be that WotC don't
want to enable anything more than basic houserule support, but to say that it's not "realistic" is drivel. All you need is a database editor (with limited permissions).