Maybe it's also a matter of "relevant, to WHOM?" Are we asking Bitcoin maximalists, or somebody whose interest is in crypto/blockchain/Web3 in a broader sense?
The world tends to be a fickle place. Is the glass half full, or half empty? Maybe the glass is refillable, but we're trying to predict what gets poured into the glass to refill it. Meaning... will BTC continue to to keep its dominance? At each halving time it tends to be at a high point; but with each successive halving it gets lower. By 2028... well, we'll (presumably) be substantially into Web3 and many more economies that likely will not be BTC based.
Time will tell...