dethrone is ambiguous because it doesn't really have any meaning and there is no "throne"! dethrone in what aspect?
in utilities, adoption and usability? not a chance. there is nothing that IOTA can do better than bitcoin.
in security of the network, and decentralization of it? not in a million years specially since there are certain centralized aspects to IOTA
in price? again not a chance because IOTA has a huge volume and unlike bitcoin it doesn't have that adoption that is needed for its price rise. so even if it reaches bitcoin's adoption (which it will never do) it still can't increase its price to bitcoin level.
in market cap? who cares
but no for same reasons above