Now’s as good a time as any for any UTXO management you might want to do. However, I don’t buy into the line of thinking that says that in the future any UTXO < 1M sats will be dust — that seems patently ridiculous to me because when 1 BTC = $10M, then 1M sats will be $100K. Fees might rise, but in dollars, not sats. No, I’m driven by the thought that if transacting at today’s value scares the bejeezus out of me, then wondering if my change is going to the right address will damn near kill me in 10 years. I’d rather, in future, have to send several UTXOs to, say, buy a house than have enough change to buy a house when buying a coffee. 

Think of it like going to the bank and taking out $1K — you might want 8 Benjamins, 2 Grants, 4 Jacksons and a couple of Hamiltons — you don’t want to break $100 to buy a coffee, but it’s fine to throw down a few $100s for a TV.