This is inaccurate. Instead, the GOP has some of these issues because of factions that comprise it. Fiscal conservatives are defined by this smaller government thing. They're just one shrinking voice amid people who want theocratic policy or big spend foreign politics.
Honestly I don't think fiscal conservatism is a "shrinking" voice within circles of those that control the GOP, I think it's a completely dead one. The only difference between what the GOP wants and what the Democrats want is the specific configuration of massive central government. IMHO all the talk about "shrinking government" and "cutting spending" that comes out of the GOP is nothing more than bread and circuses to placate the rank and file membership.
As far as "big spend foreign politics" goes both major parties are parties of
War, I think it's quite possible that we've now entered an era of
war without end where Americans that are alive today will never again see a day where their country is at peace no matter which party is in power. The river of blood and treasure being funneled into raining destruction down on other parts of the globe now stretches as far as the eye can see and Washington has become so good at hiding the realities of War from the eyes of the average citizen and creating new dragons to slay that I cannot see how it will be stopped any time soon.