I sincerely do not think that this is a bubble. First of all, one key aspect of a bubble is herd effect with majority of the population within the ecosystem of the bubble.
In this case, Crytocurrency ecosystem is the entire world economy and the present cryptomarket is just about 1 percent of the whole world economy.
However, I agree with you that some coins with no real value are being pumped and used to scam unaware investors and I can tell you that over time, that will self-correct.
The real coins with value will continue to do well! Bitcoin, Ripples, Golem, Etherum/Etherum Classic, Litecoin, Monero, Dash, Steem, Maidsafe, NEM, Pivx and many more coins with value will continue to develop and increase in value.
Remember that the total market capitalization for cryptomarket is just about a paltry 40billion USD.
The price increase is just starting. Once in a while, there will be correction that wont last but will see shit coins without values messed up. Coins with worth and value will take up the funds divested from such shit coin, and then continue to grow in value.
THIS IS MY OPINION