Heh, I must be the only one on ENWorld that likes 5e and thinks that it's the best iteration yet (aside from some nitpicks).
I mean, you're definitely not. I'd say 5E was in the "upper tier" of D&D editions for sure, and from certain angles is undoubtedly the best iteration.
Do we actually need those updated? They are still playable as is. Besides, other companies do/did those genres better.
By that logic, D&D hasn't needed updating since 2000 either!
I think the real issue is that, in 2007, WotC decided a policy where, if a unit wasn't making at least $50m/year, they were going to basically cut it. This is why 4E happened. And by making that policy (I forget the name, it had one), all other WotC TTRPGs were doomed. 5E wasn't subject to any such policy and was basically an experiment that succeeded beyond their wildest dreams (WoW was somewhat similar - it had a decent investment in money and time - $100m and 4 years, but Blizzard expected it to get about 250k subs and maybe eventually climb to the dizzy heights of 500k - in really it blasted through that and peaked at like 10-12m subs). 1D&D, on the other hand, is subject to a similar policy to 4E - it has to make a certain amount of money per year, and it's an increase on what 5E has been making.
So I think it's safe to say in this environment, WotC doesn't really have any incentive to make any non-D&D RPGs. If the space CRPG ever comes out (still sadly seems to be in eternal pre-production, after like, what 3+ years,?) and is a big hit I could certainly see a TTRPG being released to capitalize on that, but that's a few years out at least.