I honestly think many of these Alt coins are pump n dump schemes. You can make some good profits on Alt coins, if you time your exit before they collapse. The most stable and reliable Crypto currency, since 2009 is Bitcoin and that is not even disputable.
So my strategy is to play with Alt coins and to move my profits to Bitcoin in the end. Bitcoin is my store of value, like Gold is for many other investors.

we have our own Goals, Strategy to follow in terms of investment, we may have similar data, information,market research, statistics, market structure, trends, and a lot more..But we have different approach on how to deal with our own individual investment. I don't agree with your idea of Selling all ALT coins then buy Bitcoin, it is not practical, not wise, and not recommended.