The selected answer on this question provides an extremely good, and detailed, description of what is generally accepted to be the main (only?) way a terrestrial planet can form, i.e. through accretion of the gaseous disk around a forming star.
My question is: Assuming that some discovery is made that concludes that this accretion process is false (this 'hand-waved' discovery is for the sake of argument, and it need not have any other bearing on our understanding of physics beyond this unique aspect of planet formation, though it can have other repercussions on known physics if it helps generate an answer), no planets, ever, anywhere in our known universe, were created using this accretion method, what is (are?) the next most likely method(s?) of planetary creation?
Best answers will use a minimum of change to known physics whenever possible, and those changes need not be described or explained. I'm interested mainly in identifying the process itself, rather than why one process doesn't work and a new one does, I just want to know what the new process is. In other words, hand-waving known physics is allowed, but should be avoided as much as possible.
Answers do not need to consider habitability of planets, except to the extent that we know of at least 1 (Earth) in the universe that ended up habitable due to this planetary formation process. Likewise, answers should not be limited to a process that obviously excludes the possible formation of any planet that we know to have formed in reality (don't describe a process that can only account for gas giants, but cannot produce terrestrials, or vice versa).