Not hardly. It's precisely BECAUSE Protestants do NOT follow sola scriptura that they get into trouble. Protestants end up listening to this or that thick haired guy espouse some sort of "wonderful" theology that sounds very nice. Yet they seldom compare it to the scriptures to see if these things are so. Hey, we can spend three hours watching a football game but let's not spend too much time (if at all) reading God's word.
It's like the veneration of Mary, purgatory or indulgences. None is mentioned in scripture yet here you are practicing it simply because someone states that it's so. Priests and pastors give all sorts of fluffy reasoning which sounds totally rational.
Protestants are no different. It's easier to be told what to think. So instead of praying to Mary you have Pentecostals being "slain in the Spirit"; instead of purgatory you have wacky Protestants who believe the United States is the lost tribe of Israel. What's the difference? Just so long as we all maintain "free will" then it doesn't matter, right?!? Just don't drink the Kool-Aid.
The sad thing is that we have relegated God's holy and inspired word to a bookshelf while we espouse on our pompous theology finding individuals who will support our views. Instead of harmonizing scripture as the early church fathers sought to do, we seek to circumvent it by shrugging our shoulders, saying "I don't understand it." to simple passages and carrying on playing church. Thinking has become a dying art.
I much more appreciate an individual who will tell me I'm wrong about a certain doctrine or passage, laying out clear, concise reasoning using sola scriptura than to have someone tell me I'm wrong but they don't really know why or because Benny Hinn or Pope Benedict XVI says I'm wrong.
It is impossible to tell a Calvinist that he is wrong using sola scriptura because Calvinism is all a theological speculation. You look at about 5% of the scripture and ignore or spin away the rest. There is less of Calvinism in the Bible than of fish-on-Friday disciplines.
The point remains that all these sundry Protestants say exactly what you say, that they found their strange beliefs in the Bible somewhere. No one forced them to have them; they surely do not have any apostolic tradition. They read the Good Book, that's all. Just like Calvin did.