Proper market analysis should be done before any investment is made. Nevertheless, any time is a good time as long as you believe in the ICO that you are investing in. Anyways,  there is no 100% certainty of the outcome since the market is not fixed. 

what does it mean to investors and participants when the ALTCOINS goes green?

Patience is a virtue and a determining factor for a successful cryptomaniac. We must be patience in all terms of buying,  selling and trading and I know even investors has a long measure of patience for the success of the their project.  You might not make profit easily you must work it hard and get it hard, only when that is done you can be rest assured of reaching your goals.

I don't think it will crash soon. Now, with the flooding of new coins into the market I am sure that altcoins will make a total domination by 2020

Some of the coins that has high potential in gaining value and popularity, it won’t be surprising to me  for such a coin to reach a million dollar.

Ethereum to be dead...not at all. It only witnessed what is natural which is the rise and fall in its price

Of course, Crypto currency is the talk of the day. A fastest growing financial technology and now is the time to key in and make investments.