I'll explain more clearly why devaluing would be terrible and the Eur would help reduce risk.

Say you own an apartment with a 100,000EUR loan on it (most Eesti loans are in euros). You earn 25,000EEK Neto which is about 1600EUR and are paying say 750EUR a month for the loan which is about 11.5k eek. If you devalue the kroon by say 10% but your salary stays the same all of a sudden your paying 10% more to manage your loan which hasn't changed at all because it's in Euros so instead of paying 11.5k eek a month you're now paying 12.65k EEK.

For a lot of Estonians that could be the difference between foreclosure and keeping their house.

(All numbers are made up) :)

"If the kroon were to lose any of it's value it would be very bad for the average person.Officially converting to EUR would help minimize that risk."
Please explain !

The authour notes that most Estonian debtors currently carry 'euro' debt already.
Now once these people lose their jobs, will it be easier to pay back their euro loans ?

If the devalued kroon was in place, Estonian labour would be more competitively priced, and it should lead to a lower unemployment rate,
though in any case it will not be pretty.
In addition the governement could initiate national spending programs which could benefit its citizens, without having to pay the high price of the euro.

Remember, when so many politicans are pushing for Estonia to adopt the euro, the benefit will accrue to those people, not to citizens of Estonia.

At this point converting to Euro would be a good stabilizer for Eesti. The vast majority of peoples loans (house, car, student,etc) are held in Euros yet people are being paid in Kroons. If the kroon were to lose any of it's value it would be very bad for the average person. Officially converting to EUR would help minimize that risk.