I have mostly switched to PETG, due to its better transparency and much better mechanical properties. I use PLA pretty much only for purely decorative objects, and I suppose I wouldn’t miss it much if it became unaffordable compared to PETG.
PLA still has its place though. In my experience PLA can print much faster than PETG, which effectively makes it cheaper to use. If you’re scaling a print farm to do production quantities, a farm running PLA might only have to be half as big to achieve the same output as with PETG.
I print on ( regular old soda-lime) glass, and have never had the problem of prints sticking too well to the bed, unless I try to pry the print off while the bed is still warm. The different coefficients of thermal expansion between PETG and the glass mean that the print just releases by itself as the bed cools. It may well be that borosilicate glass would have problems, though, since its thermal coefficient is much smaller. (I haven’t researched this - it would depend on whether the thermal coefficient of PETG is greater or less than that of glass)