Bitcoin is a paradigm shift. Its more important value proposition is the lack of counterparty risk (which other people refer to as "self financial sovereignity"). If you're hiring a custodian to hold the bitcoins for you, you're doing it wrong.
> They think that they don't have the 'expertise'
If bitcoin is seen as requiring some special knowledge to hold it safely, it's simply a UX problem that will be solved when wallet software/hardware matures.