Eh, why try to travel so fast when we could instead slow light to a crawl? The applications for that seem more pragmatic in our lifetimes than attempting to do anything at light speed.
For instance, could we trap light (and thus its energy) in order to accumulate enough for release when we want it? It'd bring a whole new meaning to 'solar energy'. There's been
some work already in that direction and it seems at least a little less complicated.