Interesting analogy. Well at this point rugby is the definitive rugby.
I think sports analogies are inappropriate here. There is no proprietary owner of rugby or football, and the owners of the NFL don't make money by selling the game to players, instead making it by exhibiting games to watchers.
1E and 3.5 and a bunch of other editions are no longer produced.
Not produced under the name D&D. Most of them are pretty much still out there under some name.
Lots of people don't want to buy new books, read new rules, or play an edition besides the one they grew up with or own.
What motivation does WotC have to cater to them? My issue, which I don't see where you've addressed, is that this is not a financially feasible action. If you want to sell to people who don't want to buy new books, you've got to sell to tens of millions of them, like Monopoly does. I never actually saw a Red Box in a Walmart; until you've solidly cracked that market, they'll have to sell to people who buy new books.
Choice of edition has to be one of the biggest deal-breakers for getting people to commit to a campaign. In a way there's like 8 dead D&D editions (BECMI, 2.5, perhaps 4E Essentials...) that each require shared comprehension of out-of-print books and rules by a diverse group of players that can be quite opinionated. ... 5E is just moving in the wrong direction. Choice is great but if everyone has to agree on the same thing it makes consensus more difficult.
(I stare at my shelf full of roleplaying games, things like Traveller and GURPS 3e, GURPS 4e, Over the Edge, TORG, Underground, Nobilis, Aberrant, In Nomine, Trail of Cthulhu and the Mountain Witch.) <sarcasm>You have my deepest sympathy; I can't imagine what it must be like to have to pick among so many vastly different systems. And they're threatening to come out with another one; how horrible.</sarcasm>
It's interesting how games evolve. We could be in the birthing stages of a bunch of enduring roleplaying games - roleplaying is still fairly new.
We could be. If so, I don't put much hope in WotC being the harbinger of this change. Look towards Call of Cthulhu, which actually has stayed fairly stable over the years. Look towards fan games and the OSR, which hopefully can keep the same game available for decade after decade without worrying about the lack of sales. Look towards people who can do this, instead of towards a company that's dependent on a level of sales inconsistent with your enduring stable RPG.