Unfortunately such a tour setup would break with what FIS have made to tour to be, they clearly want sprint results having a possible significant value, so I think it’s fair to say they will not remove the sprint races from tour de ski.
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Regarding the 4,5 km extra for all sprint heats that sounds about right. And by maths then 45-50 seconds sounds also about right. But then we are pretty close to a minute (a minute sounds much cooler) and if we just add a small bonus for the extra effort of extra warming up and keeping the body ready between the heats 1 minute isn’t that bad when you already have 45-50 seconds based on the extra race distance 
		 
		
	 
I think the problem is that they haven't figured out how to make the sprint bib (or the points bib in the Tour) worth something separate from the season-long competition or to make the stage win reward enough in and of itself, so they want the sprint to have a significant impact on the GC to try to encourage those competing for the GC to take part, but the pursuit seems to have had completely the opposite effect, with people almost happier not to qualify in Davos. My fear is that the lesson they'll take from this is that the sprints need to be 
more incentivised rather than less in the time. Any time gained/lost in the sprint other than quali is pure artificiality, so the more impact the sprint has, the less credible the Tour results are as an actual metric of judging performance in the race. With all due respects to her, Jonna Sundling should not be sitting 3rd on GC at the base of the Alpe based almost entirely on time bonuses if the course is actually a stage race and not throwing sops to the sprinters to artificially generate "balance". She lost a minute to Niskanen in 10km, and still started ahead of her on the stage 3 pursuit.
As I say, though, I don't really know how you balance that without fundamentally changing what FIS wants to do with the race. I mean, if none of the sprint specialists want to turn up, then the field will be even sorrier than it has been here, but you look at the results and see:
- stage 1 (sprint): Diggins qualifies ~10s faster than Niskanen
- stage 2 (individual start): Niskanen beats Diggins by ~11s
- stage 3 (pursuit): Diggins finishes ~53s ahead of Niskanen after starting 28" ahead so gained 25"
- stage 4 (sprint): Diggins qualifies ~7s ahead of Niskanen
- stage 5 (pursuit): Niskanen beats Diggins by ~9s after starting 55" behind so gained 1'04"
- stage 6 (mass start): Diggins beats Niskanen by ~3s
- stage 7 (mass start hillclimb): Niskanen beats Diggins by ~9s
So when they actually raced head to head, Niskanen actually beat Diggins by around 39" by my reckoning. The remainder is time bonuses Diggins gained by being able to sprint. Both sprints being in skate technique which also disadvantages Niskanen, might I add. And that's with Diggins not actually having done all that well in the Toblach sprint.
To me, that seems too artificial. I don't agree with adding anything on to the approximation of the amount for the distance, and that 45-50 seconds I thought should be the absolute maximum. I would prefer to cap the GC bonuses at 30 seconds, and only give them for those that made the final, to introduce some more jeopardy.