I don't understand why the interest would be lower for biathlon now than before, it is still many nations competing for the top positions compared to XC skiing. For the other nations behind the absolute best, they should even have better chances now when Russia and Belarus are gone.
And there will always be power houses. Germany has a dip now (compared to before). Now Sweden has the best womens team but 2014 we had 0 female participants in the olympics, and even 2018 a top 10 place was a sensation, so even the power houses are not always the same even if they are not changing as often.
And even if sometimes the expected ones often win, there is still a chance for MANY competitors in every race.