Richard Seberg, DDS (retired)

This is difficult to answer without seeing the actual situation. But, if the previous bridge hasn't been off too long ( more than 6 mo) I find it hard to visualize they moved too far.  Your options would be 1) Place an implant for #30 as you wish and 2 new crowns for 29 and 31. 2) If indeed it is a fact #31 can not be used then the implants for #30 and #31 would be best and a new crown for #29 (no mention was made of it needing to be) extracted.

Your first and most desirable option is to indeed recreate the space orthodontically, if possible.  Given the time period there is a possibility the adjacent teeth have moved also and it may be more difficult to treat but if possible it is far and away your best option.  After the orthodontics an implant can be placed.  It may also require some bone grafting.  This would greatly improve your smile and stabilize your bite.  As for the nasolabial fold prominence a simple and effective solution could be using some filler (Juvaderm) to fill in the crease and thus improve the symmetry.