I think it's unnecessary. I would be all for having a two-hour block with the Match Game & Hollywood Squares; I can see it being similar to having PYL & Pyramid back-to-back in that both are fitting and maybe nostalgic. What I'd see happening is that they air them back-to-back one year, and then they split them up the following season. With new programming annually, ABC doesn't typically stick to the same exact schedule year after year. There are / were some mainstays with CFF at the 8 PM spot and the Match Game later on that evening, 10 PM lately until its removal from the schedule.
As mentioned, Match Game has disappeared, but I do not think it's been cancelled as of this post. The demise of it is a possibility, but I think it may be related to the pandemic and running out of material. In my opinion, maybe Alec and company wanted to wait until things returned to normal before resuming everything. If that plays out, then maybe we'll get new content in the winter and then next summer. No mention of it is a tad bit surprising, however.
On the other hand, maybe ABC either got bored with it or that there are a ton of other programs that they'd rather focus on. I actually though Match Game was alright. If there's no room for it on the network, maybe NBC can pick it up. Personally, it's a better fit on NBC anyway for several reasons, including but not limited to the host, several of the celebrities, and the taping location. If that happens, and then 4th Hollywood Squares revival occurs, then you could see them paired up. With Password returning to NBC, you might start to see that network, in addition to ABC, adding & airing a ton of classics (in primetime). Man, imagine if they could get/revive NYSI!
Finally as for MGHS, as much as it was overrated, it is underrated (barely). I actually enjoyed the concept, but the structure was a complete mess. It could've been better, but it is what it is. I could write a book on MGHSH (well, maybe a blog post max). There have been & are worse shows, just saying; it was an okay risk