Wider streets for starters so larger capacity than LV. LV streets are already jammed on a regular basis when there are no events going on.
Fenway & Wrigley are old fields and the area has developed around them. Plunking a stadium into the middle of an existing residential neighbourhood would cause a huge uproar, and I expect it would be loudly opposed by area residents. They already complain loudly about the noise, property damage and garbage left behind after games. Adding 81 baseball games plus other events wouldn't go over well at all.
We can do better than putting an additional congestion-causing venue into the middle of an already congested area.
The Rogers Centre now can be barren on non game-days. I've been through there plenty of times when there's barely another person in site. Sure, a couple of streets over is busy, but the west side plaza and the area along Bremner can be quite empty and almost eerie. It's a stark contrast to when an event is happening but a great place to walk the dog.
Obviously, we're never going to agree on LV as a site. I'd prefer to leave it where it is, especially given the large public spaces that exist around it.
Street width is definitely a good point regarding pedestrian flows. Ditto the noise complaints. It does get pretty rowdy, especially after games so despite the cool location, the backlash would be a pretty big deterrent.
Rogers Centre and the surrounding area is drab on non-game days but I believe the renovation proposals, in whatever form they may take, will seek to address that with more amenities and entertainment options. Any internal renovations will undoubtedly make a huge difference in the game watching experience. These are only reddit posts from an unconfirmed source but both offer some potential insight to what might be brewing:
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">[City Hall Watcher] Blue Jays President Mark Shapiro registers as a lobbyist, meets with Councillor Joe Cressy about future of Rogers Centre</a>.</div><script async src="
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Replacing and reorienting the entire 100 level bowl would be a huge improvement over the current layout. A transparent roof would be spectacular as well.