all junior pref holders should have mindset they are holding out for par, whether by being called or in a conversion rate that they like. I don't see treasury doing a re-IPO of common without being able to pay dividends on common, and this will only happen if dividends are turned on for prefs (which will cause them to trade to par...or even at a premium in cases of high div rate) or the prefs are "convinced" to convert, or they are called and paid out at par.
we are par-seeking missiles