it will be different if bitcoin stops continuing the current uptrend. it will have an impact on the value of ethereum in the market.
It is true that Bitcoin has effect on almost all the altcoins in the market. Somehow the who market is linked to Bitcoin. If bitcoin falls, all other altcoins bleed as well. But in some of the past events, it has been observed that Ethereum has defied that theory and has shown growth even when the market cap was gradually decreasing. If bitcoin is stable or shows steady and consistent changes be it positive or negative, the altcoin market will continue to gain momentum irrespective of how bitcoin is reacting to the market.