So realistically if those are implemented you are looking at a 10-15% reduction in gas usage in industry. I think that's manageable, obviously the heaviest industries (glass making is a good example) will struggle more. But a great deal of industrial gas is just spent on heating factories, offices and so on, so that will just mean they are a bit colder.
Exactly this, some of the gas is required for chemical processes, which is hardest to replace, but this part is tiny. Some is required for special furnaces etc. which are hard to quickly convert to other energy sources, this is somewhat easier but still difficult to replace.
But, the vast majority of the gas goes to heating, and it makes very little sense to classify the use cases "domestic" vs. "commercial" vs. "industrial", it all boils down to people enjoying being at +20degC but
managing at, say +15degC because you can put more clothes on. Yeah, it sucks, I know, but it does not force any office or any factory to go down.
The problem is overreacting to bad news, similarly how COVID was supposed to kill 1% of population, including large numbers of young and heatlhy individuals, yet it didn't.
So again what we will actually see is slight reduction in indoor temperatures (including industrial estates) but not enough to really cause serious health problems. It is way easier to personally protect oneself against cold, than excessive heat.
The lack of components (and everything else!) for the past 2 years has been a much bigger problem for industry in EU, including car industry. It doesn't matter if the factory where you can't build a car due to component shortage has indoor temperature of 20 or 15 degC.