How much would that increase any impetus toward an independent Wales?
Sauce for the goose is sauce for the gander.
Is support too minuscule to worry about?
The UK is an exceptionally complex structure - it is not like a federal system where all the parts have parallel structures. It is reasonable to look at each bit and come to a different conclusion. I'm a Unionist - I think the UK works - indeed in a perfect world I would like to see Ireland reunited as part of the Union.
England has seen its own sense of identity growing in the last decade. You do now see the Cross of St George (the English flag) which a decade ago was just about never seen.
Wales has the closest and longest relationship with England. Strictly it is a part of the kingdom of England (a principality) and uses English law, and it has an assembly not a parliament (which it voted for by a wafer thin majority on a referendum with a low turnout). While the cultural differences are strong (Welsh language spoken by some for example) there is not now a strong push towards independence. Additionally geography discourages it - there is no north-south motorway or railway. I really don't see Wales leaving the Union.
NI will stay. There is nowhere near a majority for integration with the Irish Republic (and anyway Ireland doesn't want NI) while an independent NI would be a blood bath.
Scotland is the part that in theory could go its own way. The last vote was back in the 1970s. Probably the Scots will have another one soon. It is up to them. Ireland and Iceland have demonstrated the problems of small countries. Virtually all Scottish trade is with or goes through England. Scotland gets substantial financial support from England. North Sea oil is running out and the claim that it is the Scots' oil far from clear. Nor is it clear that a breakaway nation would be in the EU - technically they have to re-apply and Spain has indicated that she would veto. My own view is that the Scots would not vote for independence. What has I think changed is English views on Scotland. Many in England would be completely unbothered by Scotland going its own way - a marked difference on say 20 years ago. We also have an oddity in the electoral arithmetic where without Scottish Labour MPs the Labour party would hardly ever have been in power in the UK. It is very hard to see how Labour can hope to win without Scotland. For Conservatives the idea is attractive. Encourage Scotland to go it alone and we've weakened and perhaps broken socialism in the remaining UK of Britain and NI.
Basically we need some blue sky thinking. An idea at the think-tank stage is for a strengthened Council of the Isles representing the UK + Ireland + Channel Islands + Man + Gibraltar, all on sterling and all with anglo-saxon legal systems. Whether Cameron has got the gumption is another matter.