Do we need a better concept than species?

Isn't it true that the most important thing from an evolutionary perspective is the degree of isolation of gene pools.We seem to want to label "very" isolated gene pools as a species.The difficulty is that only sometimes are gene pools very sharply divided. Sometimes the barrier is very leaky, sometimes it s low while it is forming in the case of recent isolation, sometimes it is thrown up and then falls and sometimes it may be very, hard to find the boundaries of (e.g., bacteria that share genes).We have recent articles about little red fire ants for example: the male line and the female lines seem to not share a gene pool at all. They are then, perhaps, from an evoluionary view separate species.