Agree with most of the comments here, not sure if reskinning the X type would have made it a major success, because it was generally never accepted as a real Jag with its fwd/4wd Mondeo chassis, the S Type at least had a decent rwd setup even though it was Lincoln sourced but much improved by Jag. If Jag had reskinned it after a few years of introduction, say 5 yrs into it's life which would have been 06/07 then maybe, just maybe it could have succeeded but the design and quality would have had to be stunning both inside and out and that meant money. Its' a shame Ford didn't have the foresight and Jaguar didn't have the funds to do this a few years ago. The game has moved on so much since then and it's so competitive in this segment with the new A4, new C Class as well as the current 3.
It's also a shame Jaguar has to wait another 12 months before even considering a case for the coupe, which means another few years before it arrives on the market but I am a Jag fan and hope they do it. Maybe in a few years time there will be a case (and the funds ) to reintroduce a 3 series challenger.