This would be one of the issues with rennovation rather than a new stadium, I would think.
We already know to an extent what the future of sports stadiums is in the form of the planned integration of augmented reality, virtual reality, sensor technology, 4D cameras, new ticketing tech, facial recognition software, increased sustainability measures and (if they're allowed) a whole lot of data mining. And then on top of that the developments we can't currently predict that will inevitably emerge over a period of say 10-40 years.
There's bound to be a degree to which a rennovated stadium, limited by the practicalities of design, is less future-proofed than newer stadiums which can be built in anticipation of future developments.
Without knowing what flaws a rennovated stadium would carry versus a new stadium, it's hard to know to what extent you risk spending a fortune to rennovate it into something comparable to new stadiums only for those new stadiums to continue upgrading more efficiently beyond that over the following half-decade.