Too many variables to make a prediction. If all things stay as they are now, I think PS4 wins.
Start throwing around the possability of PS4 Premium, PS4 Portable/Phone, Switch Pro, or Switch Phone, and it gets really hard to tell.
I think both Sony and Nintendo have everything they need to make these the largest platforms they have ever released. It just comes down to whether they want to innovate, and bring a few key functions to them. If we get phone capabilities built into one of these platforms, sales will blow past PS2/DS, and could be anywhere from 200 - 400 million units sold when it is all said and done.
If both continue down the current path, and continue to refuse to get with the times, I expect PS4 to hit 130 - 160M, and Switch anywhere from 80 - 120M.
Stop hate, let others live the life they were given. Everyone has their problems, and no one should have to feel ashamed for the way they were born. Be proud of who you are, encourage others to be proud of themselves. Learn, research, absorb everything around you. Nothing is meaningless, a purpose is placed on everything no matter how you perceive it. Discover how to love, and share that love with everything that you encounter. Help make existence a beautiful thing.
Kevyn B Grams
KBG29 on PSN&XBL