Anyhow after mentioning manipulations, buy the deep investors and contrarians attitude, it need to be seen if the graphics reflect a reality or a false / manipulated version of it? Is this why DMA and can display sudden changes of trend? On the other hand negative events and positive developments may be unexpected and unpredictable.
Time will tell. Considering more alternative elements, bitcoin and altcoins may NOT see a big slump as predicted, altcoins will if not already, start to raise slowly and steadily.
BTC price may pump more before other altcoins do, because:
BTC has more publicity to attract new and old retail investors; additionally still now is by far the main exchange pair for converting other altcoins.
BTC is the first to be targeted by institutional investors.
Last bull run (even though with less institutional interest) witnessed a huge altcoin increase that was mostly seen after passing the All Time High.
Considering the psychological sentiment, with many more alts still having 90% depreciation a recovery and / or catch up towards BTC price could take longer than BTC.
Pro on Altcoins:
There is a good chance that other cheaper altcoins witness a larger exponential growth but not before BTC pass the ATH and its price is saturated.
Valid projects of some altcoin can boost the price up even more and before BTC in the region of 100 -400% or more (as witnessed this year with: enj, Link, btt, ltc, bnb, vet and so on) however the price may not hold for long; more popular currencies though such as LTC and BCH who enjoy of more publicity are so far holding relatively well.
At the moment BTC has an overall advantage over the cryptocurrency market; this could last months before some altcoins have a bigger increase.
It needs to be considered though that valid application of other altcoins can present opportunities greater than bitcoin, even though the price increase can be short lived at least until BTC price is saturated and pass the all time high.
It also need to be considered that BTC present a high price volatility due unfortunately to manipulations (by so called big whales, for their speculative reasons) therefore some (but not all) altcoins can greatly rise in BTC value in presence of a short BTC price slump (check for example: XRP). In those cases here is worth not to fall as a panic seller but rather see it as a buy the deep opportunity.