TL;DR: I don't want to play TF2Center nor another version of PugChamp. Please keep an active list of In-Houses. We NEED a proper pug site for new players.
Forgive me for being pessimistic, but my experience in trying to play regular competitive TF2 outside of league/tournament play has been miserable. Most In-Houses have been fine for a while and then either some circlejerk joins and pretty much takes over or it dies after a month. TF2Center is Valve Comp with the proper ruleset but you have to wait 20-30 minutes for people to play medic. New pugging platforms end up like PugChamp with the same circlejerks, and whilst TF2Pickup is far better it still has the same issues.
The closest someone or something has gotten is Faceit. The old system (Before Pro League) had the right idea of clicking on a "Play" button; once you have 12 it puts people in a lobby with an 'attempt' at balancing the teams and lets the players figure it out. But that had a whole host of problems from everyone starting at the same ELO meaning balancing was awful, arguments over who played what, and because people didn't play it often the platform became inactive and degraded . Matchmaking platforms need enough players for balance and sustainability, which is one of the MANY reasons Valve Comp didn't succeed.
Finding the right solution is tough because everyone wants different things. Its why In-Houses are the way people do things right now; people have a lot more autonomy over how they want to play competitive. But that makes it harder to engage for less active or newer players.
I would like to see a proper platform/system is for that gap between Casual and Third-Party Competitive that Valve Comp was supposed to fill. Somewhere like Faceit where you can queue and play competitive in an environment with similar players without having to jump through many hoops to play. For more inactive players like myself, an active list of In-Houses with some descriptions like "Chill", "Serious", "Low-Div" and "High-Div" so one could choose what places suited them best.