No they need to get rid of clay after Wimbledon. This US Open Series is actually a decent concept as a lead up to USO and works well for TV (in fact they should do something similar before RG), but not with tournaments being played in Sweden, Germany, Croatia, Austria and Switzerland on clay. Of course those tournaments all have 'history', but then so do some of the tournaments in North America that we're routinely told 'round here need to go - like Cincy.
No, the summer clay season isn't a problem. If people want to bitch about the Americans being away from North America during the spring clay season and grass time which is a couple of months, then the same principle should apply to the US Open series.
They don't need the marketing tool before RG.