I agree amckillip, this has been discussed before, but at the end of the property acquisition to the west of the BU campus, Bradley was paying over $500,000 each for individual properties. The real value of those properties was more like a quarter of that. To acquire enough property to build a bigger arena for men's games would have been impossible for Bradley to afford.
But even if that was possible, the infrastructure in that area would not have allowed for a larger facility, and the greater traffic and parking needs. And realize that there is only one main street leading to that area, Main Street, and the traffic issues would have been impossible to overcome.
Like Drake or UNI, maybe it might have been designed for slightly more capacity, like 5,500-6,000, but that still wouldn't have solved the problem, and we'd still be having this discussion. The fact is the new arena was never designed for or intended for men's basketball.