With Mercedes, BMW, and Lexus increasing significantly in the mid 90s and onwards. I think this new concept of taking Jaguar upmarket is what the brand really needs in order to survive. It can't be a full line manufacturer anymore. But will it survive at the Maserati and Porsche level? Hard to say. This $200K USD level is heavily occupied by Porsche, Maserati, and some upscale Mercedes, and maybe Bentley if you count the lower priced models with smaller engines and fewer options.
Will it bring new clients into that upper level of car? Maybe. Will it take clients away from Porsche? Probably not many, as Porsche is a more technical focused brand and Jaguar doesn't have that reputation yet. Will it take clients away from Maserati? Probably not many, since there aren't any Maserati clients to begin with (not to make a mean joke). Maserati will probably only sell around 6000 cars worldwide this year, possibly less. Last year they only sold less than 11,000; LESS THAN FERRARI! So overall, this is still a very risky move for Jaguar. But as you said, the brand is out of good options and it was clear the previous line up was not working.