I would dispute the TRX point. My '81 Sprint Veloce had TRXs from a later car retro-fitted. It was absolutely sublime. I borrowed some standard wheels and tyres to put it through an MOT -not a patch on the TRX's. It was the lackluste (for a 'sud) 105bhp engine that let the later 'suds down and on the still later Sprints, the outboard disc brakes.
The best Sud was probably the 95 bhp 1500Ti, although the late twin carburettor 1.3Ti (1982-3 Hatchback) was quite lovely.
The 105 bhp car just wasn't as nice as the previous 95 bhp car, but Alfa had to do something to keep in sight of the Golf GTi which was really the car that took over from the Alfasud. I had a LHD R registered (that's '77 not 97!) black one and it was a cracking little thing. Alfa's response to that was the 105bhp Green Cloverleaf which wasn't quite enough.
The Alfetta series cars didn't really replace the old 105 Giulia because they were one size up. They often came from the factory with rudimentary suspension set ups and needed setting up to get the best from them. A set of Konis made them a lot better as well. Really, the Sud and Alfetta/Giulietta 116 bankrupted Alfa Romeo because they cost so much to make. But they were designed to be better than anything else and really, the Alfa 75 was a 1972 design that lasted all those years.
I really, really wanted to love the 159 but I just couldn't. I respected it for many things (styling, body and trim quality, performance etc) but for me, that final something that says 'Hey! I'm an Alfa!" was just missing. That's why I defected to BMW many years ago because it's still what it always was, a rear drive car made in Munich that isn't hiding another cars floorpan and engine bits under a famous badge.
The MiTo appears to have missed the mark spectacularly (Alfa DNA - what the hell is that??), maybe this much vaunted new rear drive car will hit the spot. I do hope so!