Owners would love to miss out on all those front row seats, of course there would be new front row seated. But over all, they would lose some capacity. Tickets are already expensive, this would just compound the issue. Also, with all these new arena being built over the past 20 years, the NHL missed the boat on this change.
If I recall the Olympic ice is the same length, but just wider than an NHL rink. Whilst the European ice is also longer and wider. So to me, the Olympic ice might be the best option.
Some of the best hockey I've ever seen was played on Olympic Ice, but obviously those players were the best in the world. Not sure how it would translate to the NHL, of the NHL game to it. Owners would still lose some seats though, just not as much.