I've actually added to my ENB (and ENF) in recent months. I happen to like double digit pay raises (dividend increases.) 
Americans have had the ability to trade ENB and Spectra for a very long time now. There is no sound reason to believe that anything will change there. Same two companies just now becoming one and with much greater efficiencies in place. And a clear path of growth going out to at least 2024. Target price of a minimum of 125.00 C$ for year end 2024 plus a dividend that is over $5.00 Cdn by then. 
Wanna bet?