I don't think that it's going to take off any more than it has already. There is a place on the market for micro and it's just another option of which more products are becoming available. Tho k it's just a customer's choice as to whether they choose micro, resin, polished Crete, tiles etc. As for trowel marks, that's should be down to customer choice but can be down to poor installation if they aren't wanted. Applicators are the same with micro as in any line of work. There are good one and bad. Some put in more effort than others and some just chase the money as it's a lucrative business. Personally I do like trowel lines in a finish. They give it detail and make it look a bit different. As mentioned the curve lines from a trowel do not help the finish at all. Especially when you can see a repetitiveness on a surface and it gets worse still when working from an inside edge and you can see the applicator only has one movement in their trowel action.
Micro has some great selling points. It's waterproof for one so wetrooms can be done in it. It's very hard wearing. So compared to a resin floor it won't scratch. Then depending on the manufacturer a really good Micro cement will be uv stable. So it won't discolour in sunlight over time. Resin is essentially made up from plastic. So naturally isn't uv stable and a resin floor will always fade in sunlight over time. I'm renovating our house at the minute and I'm a way off finishes but will be putting micro in the wet room and my girlfriend loves the penny resin floor so she will be doing this in the downstairs loo. Will bang pics up as we go in due time.
You could do with going looking at different floors and surfaces to see how different applications are done rather than basing it from one floor. There are tonnes of pics online to look at
Hope some of this has helped.
