If there was no revolution and Russia was still a monarchy, would the Romanovs still be ruling?

Its very possible that the Romanovs would still be in power had the Russian Revolution not taken place. Even if Tsareivitch Alexei had not survived to adulthood (he was the only son of Tsar Nicholas ll, the last Tsar) then Nicholas had a brother, Michael, who umed the throne after his brother's murder. But only for a couple of days and not officially. So I think the line could certainly have survived.