It might be short-sighted if the format doesn't have excellent open source decoders. MP3 won't die ever, because of LAME.
Never convert between lossy formats, not even once.
MP3 is more widely supported than any lossless audio codec. Lossless compression enables the collector to keep an original.
Not everyone is a collector though - for them, MP3 is probably fine, and if they need a different format later they'll probably just stream, re-encode, or re-purchase, in order of likelihood.