i'm getting the sense that road tubeless is like disc brake: nobody's going to ask your opinion or mine; this is where the industry is going.
It's going there really slowly.... Really, how much progress has it made lately?
It didn't take long for tubeless to dominate MTB. On road bikes the only benefit shows up if you run over goatheads regularly. Even then a latex tube will usually not puncture, IME.
i think gravel is the key. tubeless is taking over gravel as well, which will bring tubeless down to 33mm or 35mm and by then you're pretty much a skip away from road.
what are the advantages? here's what i'd say, theoretically, at least:
1. lower Crr
2. no flats
3. if you do get a flat, plug it
4. no leakdown (remember, you'll need latex tubes to match tubeless performance)
5. 1 product instead of 2 (no tube needed)
6. for manufacturers, it means the chinese will have to catch up to a new standard
on that last part, you might think that's easy, but it's going to take the chinese some time to catch up to the precision required for a tubeless. rim and matching tire. esp if there is any IP to protect western wheel makers.
and then finally, who is investing in tubed gravel tires and wheels right now? or, rim brake gravel wheels? it's just human nature. wheel and tire makers are not going to want to get left in the dust, pardon the pun. as this translates down to road, nobody's going to want to invest in old tech, or what they see is old tech.
at least that's my guess. i believe i was the lone voice in the wilderness 3 years ago in my disc brake in tri prognostication. so, do you feel lucky? do ya, punk. ;-)