Speaking only for myself, although I'M sure others would agree, I like the fact that they are releasing content slowly. I actually am not against some new mechanical content. I just want any such mechanical content to be released slowly. I don't want the error of past editions where the publishing model requires a higher number of books and then the quality starts to plummet. I'd like this edition of te game to be around for many years.
I think the title of the thread is vague. There's no general consensus about what would be an acceptable level of "more content". Exactly how much is "tons of splat"?
Some folks will say that they simply want a "little more" and then list 12 subclasses, 4 classes, 8 races, and a couple dozen feats as being "a little more". I would say that's too much all at once.
I actually think that WotC has handled it well so far. SCAG had a good deal of options, and they've provided other options in some of the adventure books and through Unearthed Arcana articles. We're on the verge of Volo's Guide to Monsters, which will have a few playable races. We know they are working on another "mechanical expansion". But many who are calling for more...not all, but many...will not even acknowledge that these things exist. They say WotC has not provided any additional material.
I don't think more is the answer from a business sense. This edition has been designed for customization. They've created the DMsGuild as a forum for people to share content. I'd prefer that players and DMs learn to lean on one another if there is a specific need for their game. Again...this is a resource that is dismissed out of hand..."it doesn't count" and so on.
So yeah...that's my take on it. I actually wouldn't be averse to a little more new content. At about the pace we've been getting it. I prefer that the folks who work on the game continue to do so in the way that they think will be best for the game. So far, they're doing well. I'd hate for their attention to be diverted simply to create a bunch of splat content to meet the demands of the few that are not happy with the options that exist.