Previous root canal tooth broke in half and now in the front. I'm so scared they won't be able to crown it (Photo)

Your dentist will definitely need a good x-ray and evaluation of the tooth.  There needs to be at least 3 mm of healthy natural tooth structure for any restoration to have a chance at success.  The "brown and black" that you see is decayed tooth structure.  Typically if a tooth like that with "questionable restorability" came into my office, I would remove the decay and take a new x-ray afterwards in addition to probing around the tooth to ensure that I have enough space and tooth to utilize.  The more tooth left over the better the long term prognosis, and visa versa.  If there is enough tooth structure, a post/core and crown should be able to have a reasonable life span.  However, if there is insufficient tooth remaining and still demand a post/core and crown be done, you cannot expect a significant life span for the restoration and most likely the restoration will break loose or fracture the tooth root and removal of the tooth.If there is not enough good tooth I would suggest not putting your money into attempting to get more time with it.  Short term thinking is going to wind up costing you much more in the end.  Think long term options and even if they are more expensive now it will save you a lot later.

Saving this one individual tooth might be possible with orthodontic extrusion, rebuilding the tooth with a new post and core buildup and a new crown.  However, because you are missing so many back teeth, you are asking the remaining teeth to take more than their share of the load.  This tooth is on your one good chewing side, so you would be working it hard.  You should consider implant restoration (likely no more expensive than the treatment listed above) of this tooth and getting a couple on the other so you can have a more normal bite and function and lessen the load per tooth

Difficult to tell from just a photo if the tooth is restorable.  An xray to check the root and a visual exam to check for fractures would be necessary to see if restorable.  Will require a post and crown if it can be saved.  I understand you would like to avoid an implant but if the foundation left to restore is not predictable, you may lose more by trying to save the tooth and then have it fail.

While a dentist may try to be heroic and rebuild the tooth, it is likely (especially for a canine tooth) that it will not last and the time and money spent will be wasted.  Usually this situation is an extraction, and either place an implant or bridge to replace a missing tooth. Canines should always consider implant first, since the bite forces "turn the corner" there, so a bridge may lead to the supporting teeth to break down.

It is difficult to say definitively from the photo wothout an xray, but it would appear that the tooth would need to be extracted and an implant placed as your best option. Your dentist would need to look and determine if their is enough tooth there to put a post in the root then build it up and place a crown. That would cost about half of an implant and crown , but it would be a weak or compromised tooth which could fail again in a few years.Since you can do the extraction now, the implant in 4-6 mos  and the crown 4-6 mos after that at the soonest, you can divide up the cost into more manageable chunks. Good luck