Not really a good idea. It's likely that the SBD will trend back to $1, and soon.

If we displayed a post worth, for example, instead of $10 (5steem@$1 + 5 SBD) as $55 (5steem@$1 + 5SBD@$10), the poster would believe that their post is worth the full $55. If SBD fell back in line to $1 the next day, their post would change to $10.

This would exacerbate the negative effect that many people have when their post loses value, like they do now when they get downvoted. People have this (wrong) assumption that the $ sign on their post is what they are going to get. They "price it in" so to speak. They believe they've already earned and deserved it. People would think they are losing their money and would not know why, when SBD goes back to what it is worth. So, I say, let them discover the "bonus" rather than expect it.

Of course, this leads into two other discussions:
1) Should we even display post $ at all until it's payed out, to avoid the negative feelings that occur when the $ goes down (e.g. due to downvotes, or falling price of steem), and,
2) Should we include conversion from STEEM -> SBD to enable market makers to convert and sell SBD to keep the peg (but also opening a can of worms on unbounded SBD creation).

Neither of which I have answers to, but both are worth thinking about.