So what could be the long term effect of having more altcoins on the market, will they help build or break bitcoin?
None and if there's any, it'll be quite insignificant; In reality, it's the other way around if you check how the market reacts to
BTCitcoin
[look at the top 10 on CMC, almost similar behavior].
Top 10 you say, well If i can make a comparison between ethereum and bitcoin I have noticed that when bitcoin is bearish, ethereum tends to be bullish and we have seen this happen quite a number of times.
I guess strong coins don't wait for the bitcoin wave, another perfect example out of the top is dogecoin which needs no introduction.
Whether it will affect or replace Bitcoin depends on the development of altcoins. Bitcoin quietly accumulated a large amount of computing power in the early stages of its development.
Are you talking about bitcoin mining, or rather the coin that takes up more computing power can dethrone btc?. But what happens to those coins that don't need the kind of mining that btc has...