I don't think any altcoin especially ethereum will be able to match or compete with Bitcoin's reliability or its value. Bitcoin has proven itself to be amazingly incredible over the years and yes Satoshi himself gave it a huge head start, many altcoins have emerged, yet Bitcoin has remained the most recognized and valuable cryptocurrency, it's dominance is unmatched. Over the years Bitcoin has managed to maintain its position at the forefront.
Bitcoin have proven itself to be among the best over the years, people seems to compare etherum and see it as a rival base on the influence and it also being the most popular coins when it started and how it have brings a lot of project under it is something that others consider as being influential but in terms of value and usage it can’t be compared to bitcoin it lack they features being centralized alone have disqualified it from the competition.