Yeah - a loveless marriage is possibly the saddest place you could ever be. Don’t do it to yourself. (which, admittedly, you seem unlikely to.)

Whilst, yes, abolishing marriage might be a good idea there are certain legal and tax advantages to being married (in some jurisdictions). These would need to be worked out to apply equally to all couples (thrupples, polygamous communes, multi-wife faiths etc.) but wouldn’t be impossible.