Is it theoretically possible that it can be too late to have a surgery?

I mean, I have a damaged spinal cord. Surgery was needed. Healing is claimed to be possible but takes years.

What if it was so far gone already that the damage had started and is beyond the point of healing; the situation to only get worse?

I obviously don't know the exact nature of your condition, but nerve damage can be permanent and irreversible. Nerve damage can develop over time after an injury, or in the spine, can occur due to degenerative changes in the vertebral bodies. The length of time that the spinal cord or nerves are subjected to pressure, stress or damage increase the likelihood that permanent nerve damage will be sustained, and that surgery will do no good, in that the nerve damage itself can no longer be reversed so alleviating the pressure or stress is no longer useful.

My specialty is radiation oncology, and we see this kind of thing happen frequently when patients have metastatic cancer in their spine.

Most Drs. would go for it. Had one done in 95 and today my 20% would be about the total cost then! But the medical bunch would get paid if I expired on the table!