I sort of did that on Black 2 as well, but swapped out team members as I found out what was available because the Unova Pokemon aren't necessarily all that impressive statistically.
I think it's better than the dumpy old Metrodome. It's reasonable considering that it should age considerably better than the Metrodome, and from a sporting perspective, we need it (and from a large concert perspective, it'll probably be an impressive venue), it's also a community commons and can make for a great emergency situation staging area, being physically double the size of the Metrodome, and it'll "interact" with the streets much better than the Metrodome ever did. The Metrodome is also 30 years old, and while it can last to 50 years old, the Metrodome is more of a safety hazard given the likelihood that the roofing might have been kept well over the roofing material's life expectancy (remember the Metrodome roof collapse in 2010?). This new stadium also won't use air pressure to support its roof.
It'll also look like somewhat like a sailing viking ship.