Kit Lens and 100% crop, should I care?

I have learned so much about photography on this forum, its such a valuable pot of info. Everyone is so patient and willing to help noobs out. I am planning on buying the nex 5n (or the new F5 version this summer). My question is this:

I have been a long time point and shoot user who was always frustrated by the bad indoor, low light pics that come with one. Which is why I am getting the NEX. There will be outdoor bright light pics as well, but mostly my pics will be from night, indoors, parties, bars, etc and for once I want high quality low noise higher iso shots.

I have no intention of blowing up my pics, doing 100% crops, pixel peeping, etc, they will be viewed on screens and re-sized to smaller 5x7 and such for viewing on computer screens. So should I even care about all the reading I have been doing about how sharp the kit lens may or may not be, the fringing, the CA, etc??

Thanks for everything!!