I don’t think you see the concern
If the concerns are true then this is a disappointment for video users
imagine if the burst rate on your camera was limited by temperature. You would miss shots or change what you really wanted to do based on how warm your camera.
That's just not how video production works. You're not continuously recording long clips. Run the same clip too long in any finished product and you will quickly lose your audience. If you pay attention to professional productions even long interviews involve short clips with slight scene changes and intermixed content so the viewer doesn't fall asleep.
Heat build up could be a concern for...
A) A vlogger who literally hits record and does one long session. Note that this is amateur hour as the professional vloggers clearly edit together short clips that alter the scene/angle slightly even when they're just talking, again because the viewer gets BORED TO TEARS if you don't. Also: do these people need more than 1080p? No, no they do not. Even the YouTube 4k quality argument doesn't hold because it's a compression issue with YouTube so you can simply upscale 1080p to 4k to bypass the issue. I can think of at least one very popular/talented video production vlogger who has access to high end dedicated cinema cameras who produces his YT videos using Canon hybrid cameras at 1080p. And his videos never lack for quality. I was also under the impression that Tony and Chelsea had abandoned a m4/3 4k studio setup for a Canon FF 1080p studio setup because of DPAF.
B) A live event like a press conference. Probably being covered by someone with a dedicated video cam.
C) A live sporting event where even if you're shooting short clips, you're shooting them one on top of the other in rapid succession so heat builds up. Again, probably being covered by a dedicated video cam with B footage from cameras like the 1DX mark III and in the near future R5 and R6.
Everyone envisions themselves producing the next Indie film and gets sad because a camera has thermal limits. Yet an actual film production is the one place where the thermal limits are probably not going to matter because of the length of time between every take to check/alter sets, retouch makeup, mess with lighting, direct actors, etc.