Cut off the one that's not blooming, soak it well, and pot it up. Next time, you get three roots about 3" long on a keiki, cut it off and pot it up and don't wait, if you want individual plants. Every eight to ten days isn't much water if it's in a medium bark. When you see silver roots, time to water. Waiting until aerial roots are 6-8" long is too long, so get it done. Roots grow to adapt to their environment. Those are the two reasons your aerial root you put into bark likely failed. If you have new roots that keep stalling, again, likely lack of water. Overwatering doesn't kill orchids. Lack of drainage and air flow at the roots does.
The one you already removed a ways back, water more often and provide more humidity. Put into a large tall vase or drop an open baggie over the top or set a humidifier next to it.
Yes, hybrid phals usually stay in bloom for at least three months or more if they're healthy.
Pictures are worth many more words that words alone.
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Caveat: Everything suggested is based on my environment and culture. Please adjust accordingly.
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