I think you are looking at this backward. LS Mtron is the parent company and thinking that they would stop making LS tractor brands and just make a rebadged tractor is like thinking that GM is going to stop making Chevy's and start making Kias or Fords.
LS didn't stop making Montana because they went to a different branding. Montana company went under and they were buying their tractors from LS just like New Holland so when Montana USA went under, no longer did LS badge the tractor but parts can be ordered for the Montana if you know the equivalent LS model. I would be more concerned about parts from NH, Massey, Case etc who badge their tractors made by LS. LS Mtron isn't going anywhere with their models but might not see any reason to support the other dealers if they drop their contract (like Montana did).
If you buy and LS tractor, LS is going to support it and dealers are on the rise not on the fall. When I bought my LS 6 years ago, there was only one dealer within 100 miles, now there are 3 that I know of and maybe more. I haven't kept up with pricing of the other tractors of similar HP to LS but when I bought mine, I got 20 more HP (70) for the same price as MF and Kubota 50 HP models AND got more standard equipment. Compared the Mahindra to the LS when I bought and it was like comparing a Chevy to a Mercedes in fit, finish, ergonomics AND accessories.