In 2020 during the first 6 months that border-restrictions were imposed, Thai Immigration made it very difficult for those at the end of their permission to stay to extend that stay. And in the usual Thai chaotic way, there was no nation-wide consistency in the requirements imposed by local Immigration Offices for extending your stay and those requirements differed widely depending on where you applied. As a result they actually chased out many foreigners that wanted to stay longer (e.g. the ones that made use of the ME Non Imm O Visa and had to make 3-monthly border-runs). All this, while the TAT. alarmed by the falling tourist entries, started launching campaigns to attract tourists (all foreigners are 'tourists' for TAT even if their intent is long-term stay).
It dawned very slowly on the always inward-looking Thai Immigration officials that very little new tourists/long-term stayers were coming in, and when finally that penny had dropped - maybe with some pressure from TAT and the cabinet - they introduced the 60-day covid-extension option. In the beginning they even imposed some impossible administrative burdens on getting that one (they never learn), but most probably Imm Office 'management' interfered and had to re-educate the local 'be tough on foreigners' Imm Offices to be more welcoming. I even remember end 2020 the nation-wide Thai Imm Office chief visited local offices to personally bring a 'Be Nice to Foreigners' message.
Bottom line is indeed that with large scale tourism not coming back anytime soon, in spite of all the Grand Initiatives to attract tourists/long-term stayers (but sabotaged by their now ever-changing 'requirements' for those tourists showing an interest), it would be utter stupidity to end the current 60-day covid-extension option. That would force once again all those making use of that option to exit Thailand, and with current border restrictions and quarantaine rules it is doubtful that they simply would come back on a 'legit' Visa. So imo - and if Immigration has any sense in its bureaucratic body - they will prolonge that 50-day covid-extension option until border and quarantaine restrictions are eased (allowing a quick same day border-run).