Nah. That would be too idiotic, even for CA. That's not even a similar enough genre.The towers and supply system exists to appeal to people who play shitty MOBAS. Same way Dawn of War 3 tried to appeal to that crowd. No other reason.
Sieges worked fine in Attila and 3K
People complained like crazy about siege battles, and that was their solution...
I didn't play Attila, but they definitely worked fine in 3K and CA got lots of praise for how much better the sieges are there.
Why they decided to not pursue that line of sieges but instead went with what they did... who knows.
I'm sure people complaining about sieges is why they also introduced those survival battles - and botched those as well. Instead of a long battle of attrition, you have a drawn-out easier-than-normal battle
They didn't pursue it because the supposed Warhammer 'a team' are a gaggle of smug twats that will never accept good ideas from the 3k or Sofia studios.