When I married and American and moved there my Mum asked me over the phone "but Kevin, would it mean as much to you to win an Olympic medal for the US as for the Great Britain". Now bearing in mind I was in my early-mid 20s and the chances of Olympic glory were less than zero
, I could still answer honestly that "Yes, it would"
Competing at the highest level and gaining success should be enough motivation.
If I moved to Zimbabwe tomorrow and ended up playing an ODI or 2 then Id give just as much (if not more) effort than if I was playing for England. Im sure most would, as there is the added incentive of giving a big "**** you" to those that doubted them in their home country (eg Caddick, KP etc)
As it is, Olympic Gold and International cricket are but a dream.