The good thing about electoral reform is that most people won't care about the details, or understand them if they do care. It will also take well into the next parliament or later to put into effect, so may never happen.
He seems more serious about the social care issue, and is hanging his hat on enough people realising its needed. I hope he's right to be honest.
I think the three big takeaway 'promises' – electoral reform, social care, and relationship with the EU – could help get them over the line at the next election, if they don't screw up otherwise (far from a given, given world politics/economics). And I think all three are things where an electorate might actually be receptive to constructive change, rather than the negative backwards-looking destructiveness of Reform etc.
In the end, negativity just eats people up and turns them into narrow-minded bigots, and (I'd like to think, at least) that things that suggest "we could do this better" might at last have some appeal. Who knows? But I guess we'll find out.