What chance are there that Sporting will produce another player that's going to end up one of the all-time top-10 (probably in the top half, but I don't want to start a meaningless debate)? They had a fantastic history and yet they've only produced two players that really made the mark on the world football – and with all my love for Figo, he was never in consideration for being the best player of all-time (or even a penultimate player of his generation, that would be Ronaldo followed by Zidane). Let me answer my own hypothetical – those chances are close to zero.
And even if they somehow manage to produce another player of Cristiano's caliber, it still won't be embarrassing for them to have an academy named after Ronaldo. Especially since that young prodigy will, in all likeliness, grow up to be a massive Cristino fanboy.
Again, I doubt that United fans would be against honouring Charlton by renaming Carrington* after him. I, personally, would be very happy if something like this ever happened. Charlton has more connections to United than Cristiano has to Sporting, but, again, while Sporting is a big club, they're quite obviously a tad smaller compared to United.
*Trafford Training centre is the official name apparently, I never even knew that! Some fan I am.
Bellingham's thing was embarrassing. This is not.