Yes, times have changed a lot. There are a lot of altcoins that took the hype from bitcoin in the last month, like ETH, Ripple and LTC, but I don't think that they fully take it over unless they can really gain the support of the community. Although bitcoin has many issues that is still unresolved, that's not enough to sway investors from moving out their funds and go to altcoin market. So there's no chance for the alt's to make bitcoin step down even for a bright moment.
And now, since the market is crashing, bitcoin's dominance will go up again. After everything settles down, investors who have sold off will go back to bitcoin because the price is cheap at the moment. And then it will enjoy another rally while altcoins will suffer and go back to its normal price.