The next 3 upgrades the ACC/Scotiabank Arena should consider IMHO, in order of importance:
1. Improved PATH connectivity - yes, those stairs are awful! An escalator that directly connects ACC's second level with the Union entrance off Maple Leaf Square is long overdue, especially with the Harbour Plaza/RBC/Sun Life traffic now. Transferring Union foot traffic to the second level gate would also help avoid the mosh pit that always forms at Gate 1.
2. Gate 1 Galleria uplift/lighting - only part of the arena that still looks untouched from 1999.
3. Green Roof - interior wood ceiling like MSG would be amazing but unrealistic. A nicely lit green roof would look incredible once all the buildings go up around it, not to mention all the practical benefits.