Hitler was right. The Sturmabteilung had a quite prevalent strain of thirdworldism among young SA men. There was a general belief that Rohm should continue the revolution, and that they should align with the "League of the Oppressed" in the British Commonwealth. Hitler hated this, he refused to tie the destiny of Germans to backwards foreigners, and he clearly felt it was better to lose to the inevitable fight with the English on your own terms, if you can't befriend them. And we all know eventually Rohm was arrested at Bad Weissee, and Hitler went on to nearly conquer the world.
If Rohm and the more revolutionary contingent of the rural young men in the SA had their way, they probably would've ended up in an open conflict with the Reichswehr who they aimed to replace, and they probably would've been killed. Remember, the SA were not the elite fighting force the SS became. They were yokels who fought with dogwhips and carried Roman-legion style Signa (banners) into cities to brawl. They were "wignats" in a way.
There were nationalist partisans who viewed other nationalists as allies, rather than possible subordinates in a new world, and those guys all ended up fighting alongside commies and dying. If you believe your people have a destiny, history seems to favor those who really commit to the bit. Time is not kind to half-measures or cowards.
Never trust a nationalist who thinks he needs the help of anyone outside the national identity. The fact the far right hasn't learned this, is abysmal.