I'm not one to deny that it'll happen, but am a little less enthusiastic than some because of the very issue you bring up - stadium design. Most new stadiums, even NFL, in the last couple of decades are disappointing in one important aspect. They drag the sidelines away from the field and the lower levels are too flat. If we could get something like Oregon's I would be thrilled. Fans close to the field and steep slope. But something like Baylor? No. UCF? No. I want a real home field advantage. So it doesn't have to be an OB replica, but something that is tight and intimidating. That, with partial cover similar to Hard Rock that reflects noise? Even better.
Of course whether we could actually draw more fans there than Hard Rock is another matter and a valid debate, considering where the center of population is in the metro and that UM students can never remotely fill a stadium.