Cotton is the major fiber crop and there has been a lot of Research and development in this particular crop until now. Surely, research on this widely cultivated crop will be more and as a result more advancement. But with the shortage of the irrigation water, cultivation of cotton seems to plummet very soon to be ready for such situation research and improvement of those wild fiber crops and even domesticating them will be a positive move.

We should be very cautious about using biomass crops, as the magnitude of the negative impacts of their introduction to new places - might be detrimentally increased. Other then that, it's an interesting concept.

Yes definitely! The world is awash with plastic fibers that are turning into micro plastics and are now being found not only in oceans but on mountain tops and polar regions. I can't recall anyone finding the residue of natural fiber being detrimental to any ecosystems and they have been used for thousands of years, unlike plastics which don't even have a full century of use. Relative to cotton R&D, the world has greatly neglected R&D into existing commercialized natural fiber crops (e.g., jute, flax, hemp, kenaf, ramie, sisal, kapok, etc) but also done almost no research into plants like milkweed, cattails, Indian hemp, etc that: 1) have different properties than the already commercialized natural fiber crops, 2) grow in different climates and/or in different soils and/or with different moisture needs, 3) have potential to be grown and harvested cost-effectively for a profit. Brazil is one country that has commercialized several local plants for fiber production and some are already used in commercial applications like auto part manufacture.