Acceptable yes, pysically possible... honestly not really.
On Train, allowed... yes... stopped... probably not.
I play roller hockey, looove my skates, have them in Japan, but have only used them when I specifically get together with my friends for the purpose of playing hockey. And then we go to a park that we only go to for that purpose. For recreational skating you would also have to travel to your location before putting skates on.
Generally, the roads are too crowded, too hilly, and to many old people to make using skates as transportation in the big cities a reasonable idea.
Now, Paris on the other hand... you would be amazed at how many people rollerblade over there! They're NUTS about it, and it is fully accepted as a regular means of transportation. Even business men will put on their stakes and skate to work while wearing a suit! Tres bien!