Jaded years ago
"Perhaps we've got a bit jaded from listening to at least ten years of predictions that mobile malware was going to be a multi-million pound problem next year or the year after."
We got jaded years ago, thanks to wolf-criers like yourself, Dan Goodin and Kelly Martin. Martin at least grew a clue since 2006, and you've toned down considerably, writing more thoughtful commentary such as this. You'll be hard-pressed to undo the damage, though.
"If you standardise you increase the security risk potential."
Martin claimed that, "Mobile phones are becoming a vector of attack," in 2005. Java was ten years old by 2005, and it was present in many mobile devices. Yet we haven't seen a Java virus. We haven't even seen an exploit in Open Wave's Mobile Browser, which inhabited more handsets than Java did.
Standardization itself hasn't increased the risk. The only thing standardization seems to have done is allowed Symantec to release an anti-virus product for mobile devices. Great. Nothing like wasting paid G / 3G bandwidth on anti-virus updates. Talk about a solution in search of a problem, and talk about being jaded against standards.