Sounds like Wolf has a problem! Ground radar is in use at most large airports now (Tenerife was 1977!) and trains DO still collide - more frequently than airliners!
The simple answer is yes, it could happen again. No human is perfect and no computer can allow for all possible scenarios and variables. However we do learn from mistakes and implement measures to reduce the risk of the same thing happening in the future. Tenerife was an extreme example - it resulted from the following factors which are EXTREMELY unlikely to repeat:
1)Original destination closed due to terrorist bomb.
2) After 3 hr delay, KLM flight then decides to refuel (not required, they had more than enough)
3) 25 minute additional delay caused by refueling, during that time fog rolls in and reduces visibility to almost zero
4) Due to back up on taxiways from traffic diverted form bomb-hit original destination, aircraft have to taxi back on the runway, not the taxiway
5) Missunderstanding of clearance by KLM flight - they were not cleared for take-off
6) This was caught by the Pan-Am crew who transmitted a warning to the control tower that they were still on the runway. Unfortunately KLM also transmitted at the same time and the calls blocked each other so no-one heard them.
All in all a horrible chain of events! Crew training and airport procedures have been greatly improved in the intervening years and although technically it is still possible, it is highly unlikely.
You are more likely to be killed driving to the airport so don't worry about it.