(Bloomberg) -- An expected wave of European bank consolidation will be driven by local mergers rather than the kind of headline-grabbing, cross-border deals many see as necessary to creating regional champions.That’s because weak stock prices in the sector are curtailing the fire-power required for lenders to pull off truly transformational deals, advisers say. A fragmented regulatory landscape and risks associated with sovereign debt exposure could also keep tie-ups within national borders.“There is a sense in some boardrooms that share prices have to improve before making major...